Preliminary model of porphyry copper deposits

Berger, Byron R.; Ayuso, Robert A.; Wynn, Jeff; Seal, Robert R.

doi:10.3133/ofr20081321

Cited by 70 publications

(35 citation statements)

References 89 publications

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“…In the porphyry systems most of the ore mineralizations containing intrusives, have calc-alkaline character. In general, in the volcanic and pyroclastic rocks, particularly in andesitic, dacitic, rhyodacitic rocks and in their subvolcanic equivalents, veins, breccias and metasomatisms of the sulphur bearing minerals are present (Sillitoe, 1972;Mitchell andBell, 1973, Sillitoe, 1973;Aral and Erler, 1981;Ayhan, 1991, Sillitoe andBerger et al, 2008;Sillitoe, 2010). The main mineralization body is found enclosed by a pyrite rich shell.…”

Section: Discussionmentioning

confidence: 99%

Alteration Zones Associated With Eocene Magmatism in the Olur (Erzurum) 9 Area, Eastern Pontides and Their Significance

Önal

Akyildiz

Cengiz³

et al. 2017

Bulletin of the Mineral Research and Exploration

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The Alpine Orogenic Belt with numerous porphyry Cu-Mo-Au mineralizations, starts from Eastern Europe continues through Turkey and the Caucasus and extends into Iran and Afghanistan. The study area of the Eastern Pontides is in this orogenic belt. Using fi eld and laboratory studies an attempt has been made to establish the origin of Yeşilbağlar, Kaban and Köprübaşı alteration zones in the Olur area (Erzurum). In the study area Early Eocene Coşkunlar volcanics and sub volcanic rocks have contact with the Oltu çayı volcanics of Early-Middle Jurassic. Alteration in the study area effects these Oltuçayı and Kaban volcanics. In the study area mineralizations are present in the alteration zones. Disseminated, stockwork, vein/veinlet and fi ssure type mineralizations are present in the Coşkunlar dacite. Paragenesis in the alteration zones are pyrite, chalcopyrite, sphalerite, galena, pyrrohotite, quartz, calcite and barite. FT-IR and XRD studies showed the presence of clay, sulphate, sulphur, carbonate, silicate and oxide minerals in the alteration zones. Field and petrographical studies showed that alteration types in the Yeşilbağlar, Kaban and Köprübaşı areas are, advanced argillicargillic, pyropylitic and sericitic. They are similar to the alterations present in the upper part of the mineralizations in the porphyry systems of the Alpine Orogenic Belt. In the Eastern Pontides starting in Early Jurassic, continuation of subductions resulted in closure of the İzmir-Ankara-Erzincan ocean and in Early Eocene the Taurid platform collided with the Eurasian active continental margin. Data from the study area indicate the presence of alteration zones in the upper part of the buried porphyry system and the possibility of mineralized parts in the deeper parts of the system.

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Section: Discussionmentioning

confidence: 99%

Alteration Zones Associated With Eocene Magmatism in the Olur (Erzurum) 9 Area, Eastern Pontides and Their Significance

Önal

Akyildiz

Cengiz³

et al. 2017

Bulletin of the Mineral Research and Exploration

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“…This evidence map has been classified using C-A fractal model which is presented in Figure 5. Hydrothermal fluids broadly effect rocks and produce specific alteration zones including potassic, phyllic, argillic and propyllitic in porphyry copper systems (Alimohammadi et al, 2015;Beane, 1982;Berger et al 2008;Byron and Berger 2008;Lowell and Guilbert, 1970;Meyer and Hemley, 1967;Silitoe, 2010;Sillitoe 2010).…”

Section: -1-geological Layermentioning

confidence: 99%

Porphyry Copper Prospectivity Mapping Using Fuzzy and Fractal Modeling in Sonajeel Area, Nw Iran

Yazdi

Rad

Aghazadeh

et al. 2018

Bulletin of the Mineral Research and Exploration

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Main purpose of this research is to present a local scale GIS-based mineral prospectivity model for prospecting Cu porphyry mineralization, and to validate the produced model by field observation, surface sampling and drilling data. Sonajeel area which is the subject of this study is a part of Arasbaran mineralization belt, NW of Iran.Constructing a mathematical exploratory algorithm based on a mineralization type is a complicated and interdisciplinary task. For this purpose, results from processing and interpreting different data sets including geology, geochemistry and remote sensing were considered. A comprehensive exploratory integration model was built up considering the exploration stage and the descriptive porphyry mineralization model suggested by Sillitoe, 2010. In order to prepare inputs for GIS-based exploration model, value assigned grids or evidence layers were produced using fuzzy membership curves and then integrated via gamma fuzzy function. In addition, for defuzzification and prioritizing the mineral prospectivity map, a Concentration-Area (C-A) fractal model was applied on the pixel values of the prospectivity map. Finally, the results were confirmed via field observation, surface sampling and drilling. Borehole logs at the first priority displayed a Cu mineralization zone with an average grade of 0.5%.

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“…The conventional geological methods to identify mineralized zones in porphyry deposits are mineralogical and petrographical studies (Schwartz 1947;Lowell 1968;Lowell & Guilbert 1970;Beane 1982;Cox & Singer 1986;Sillitoe 1997;Melfos et al 2002;Berger et al 2008). Fluid inclusion and sulphur isotope studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Correlation between geology and concentration-volume fractal models: significance for Cu and Mo mineralized zones separation in the Kahang porphyry deposit (Central Iran)

Yasrebi¹,

Afzal²,

Wetherelt³

et al. 2013

Geologica Carpathica

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This study identifies the major mineralized zones including supergene enrichment and hypogene enrichment in the Kahang Cu-Mo porphyry deposit which is located in Central Iran based on subsurface data and utilization of the concentration-volume (C-V) fractal model. Additionally, a correlation between results achieved from a C-V fractal model and geological models consisting of zonation, mineralography and alteration have been conducted in order to have an accurate recognition and modification of the main mineralized zones. Log-log plots indicate five geochemical populations for Cu and Mo in the deposit which means that mineralization commences with 0.075 % and 13 ppm for Cu and Mo (as the first thresholds) respectively. The main mineralization began for Cu 0.42 % and Mo 100 ppm and also enriched mineralization containing Cu 1.8 % and Mo 645 ppm which is located in the central part of the deposit. According to the C-V model, the main Cu-Mo mineralized zones occur in the hypogene zone, especially in the central, NW and NE parts of the Kahang deposit. The supergene enrichment zone derived via the C-V model is smaller than that in the geological model and is located in the central and eastern parts of the deposit. Results analysed by the C-V fractal model certify that the interpreted zones based on the fractal model are accurate. To certify this, a logratio matrix has been employed to validate the C-V fractal model for the Cu and Mo main mineralized zones.

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Preliminary model of porphyry copper deposits

Cited by 70 publications

References 89 publications

Alteration Zones Associated With Eocene Magmatism in the Olur (Erzurum) 9 Area, Eastern Pontides and Their Significance

Alteration Zones Associated With Eocene Magmatism in the Olur (Erzurum) 9 Area, Eastern Pontides and Their Significance

Porphyry Copper Prospectivity Mapping Using Fuzzy and Fractal Modeling in Sonajeel Area, Nw Iran

Correlation between geology and concentration-volume fractal models: significance for Cu and Mo mineralized zones separation in the Kahang porphyry deposit (Central Iran)

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